#include<iostream>
#include<vector>
using namespace std;

class TreeNode
{

    TreeNode* l;
    TreeNode* r;
    int val;
public:
    bool operator<(const TreeNode& a1, const TreeNode& a2)
    {
        if (1)
        {
            return true;
        }
        return false;
    }

};

int main()
{

}

